ceph/src/boost/libs/fusion/include/boost/fusion/container/map/detail/cpp03/value_at_impl.hpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2011 Joel de Guzman
   3     Copyright (c) 2011 Brandon Kohn
   4
   5     Distributed under the Boost Software License, Version 1.0. (See accompanying
   6     file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   7 ==============================================================================*/
   8 #if !defined(BOOST_FUSION_MAP_DETAIL_VALUE_AT_IMPL_HPP)
   9 #define BOOST_FUSION_MAP_DETAIL_VALUE_AT_IMPL_HPP
  10
  11 #include <boost/fusion/support/config.hpp>
  12 #include <boost/mpl/at.hpp>
  13
  14 namespace boost { namespace fusion
  15 {
  16     struct map_tag;
  17
  18     namespace extension
  19     {
  20         template <typename Tag>
  21         struct value_at_impl;
  22
  23         template <>
  24         struct value_at_impl<map_tag>
  25         {
  26             template <typename Sequence, typename N>
  27             struct apply
  28             {
  29                 typedef typename mpl::at<typename Sequence::storage_type::types, N>::type type;
  30             };
  31         };
  32     }
  33 }}
  34
  35 #endif //BOOST_FUSION_MAP_DETAIL_VALUE_AT_IMPL_HPP